<!DOCTYPE html>
<html lang='en'>

<head>
  <meta charset='UTF-8'>
  <meta name='viewport' content='width=device-width, initial-scale=1.0'>
  <title>Switch</title>
  <style>
    body {
      background-color: rgb(247, 250, 95);\
    }
    .box {
      width: 200px;
      height: 110px;
      background-color: rgb(92, 134, 250);
      border: 4px solid gray;
      position: absolute;
      left: 50%;
      top: 50%;
      margin-top: -55px;
      margin-left: -100px;
      border-radius: 10px;
      font-size: 40px;
      font-weight: 400;
      color: white;
      outline: none;
    }
  </style>
</head>

<body>
  <form name='input' action='/SWITCH' method='POST'>
    <input type='submit' value='操作成功' class='box'><br>
  </form>
</body>

</html>